Semi trailer under-run protection device



FIG. 1 is a first perspective view of a semi trailor under-run protection device showing our new design;

FIG. 2 is a second perspective view of a semi trailor under-run protection device showing our new design;

FIG. 3 is a front view of the semi trailor under-run protection device of FIG. 1;

FIG. 4 is a rear view of the semi trailor under-run protection device of FIG. 1;

FIG. 5 is a top view of the semi trailor under-run protection device of FIG. 1;

FIG. 6 is a bottom view of the semi trailor under-run protection device of FIG. 1;

FIG. 7 is a left side view of the semi trailor under-run protection device of FIG. 1; and,

FIG. 8 is a right side view of the semi trailor under-run protection device of FIG. 1.

The broken lines depicted in the foregoing figures are for purposes of illustration only, and form no part of the claimed design. 

CLAIM The ornamental design for an semi trailor under-run protection device, as shown and described. 